[Tile-serving] [osm2pgsql] Add documentation and improve legibility style.lua (#345)

[math1985]

>  polygon_keys = { 'building', 'landuse', 'amenity', 'harbour', 'historic', 'leisure', 
>        'man_made', 'military', 'natural', 'office', 'place', 'power',
>        'public_transport', 'shop', 'sport', 'tourism', 'waterway',
>        'wetland', 'water', 'aeroway' }
>  
> +-- Objects without any of the following keys will be deleted

Yes, this is true. Objects without any key in this list will be skipped.

Moreover, objects that do have a key in the list, but no column name (for example an object tagged only with capital=yes) will be skipped too.

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